Search published articles


Showing 2 results for Humic Substances

M. Kafi, N. Daneshvar Hakimi Meybodi, A. Nikbakht, F. Rejali, M. Deneshkhah,
Volume 4, Issue 1 (3-2013)
Abstract

To investigate the effects of humic acid and mycorrhiza fungi on visual quality, some characteristics of roots and chlorophyll changes of ryegrass, an experiment was carried out in Research Greenhouses of Department of Horticultural Science, University of Tehran, in spring and summer of 2009. The ryegrass was “Speedy green” perennial ryegrass, which is composed of three lolium (Lolium perenne L.) cultivars. After autoclave of the soil, addition of inoculums of mycorrhiza fungi (Glomus mosseae and Glomus intraradices) to pots and sowing of the seeds, plants were given enough time to grow. After establishment, humic acid was sprayed on leaves at concentrations of 0 (as control), 100, 400 and 1000 mg/L, and the above-mentioned characteristics were measured until the 9th week after starting the treatments. The results showed that humic acid was significantly effective on chlorophyll a, b, and total chlorophyll content, root length and fresh and dry weights of roots but had no effect on visual quality, root volume and colonization percentage. Mycorrhiza fungi were effective on all characteristics. Among the mycorrhiza fungi, G. mosseae was better than G. intraradices on root factors, while had no positive effect on aerial parts. Colonization percentage was almost equal in both fungi. The effect of mycorrhiza fungi on the above-mentioned characteristics, with respect to the inoculums solution, was probably due to the production of hormone-like effects and enhanced hypha density in soil.
H. Bagi, E. Chamani,
Volume 7, Issue 3 (11-2016)
Abstract

To evaluate the effects of different concentrations of iron nanoparticles (10, 100, 1000 and 2000 mg/L) and humic acid (100, 1000 and 2000 mg/L) on growth, flowering and characteristics of cut rose flower, cultivar White Nablus, under hydroponic system, an experiment was conducted based on completely randomized design with factorial arrangement and 5 replications in the Research Greenhouse of Mohaghegh Ardabili University in 2012-2013. Nutrient solution, formulated by Van Zinder and Baker, was used. This nutrient solution was dissolved in the twice-distilled water. Results of the experiment showed that chlorophyll content of leaves was significantly (P≤ 0.05) affected by 1000 mg/L iron nanoparticles and 100 mg/L humic acid, compared to other concentrations. High concentration of iron nanoparticles and humic acid (1000 mg/L) had a significant effect on plant height, chlorophyll fluorescence, cut flower length, total dry weight of cut flower, leaf dry weight and total dry weight, compared to other concentrations. Different treatments of Iron nanoparticles and humic acid did not significantly (P≤ 0.05) affect number of leaves, leaf area and time to flowering. Iron nanoparticles increased flower vase life, whereas humic acid did not significantly (P≤ 0.05) affect the vase life.



Page 1 from 1